Fuse Pull: Low Octane Fuel Fix For L99 and LS3. Reset Fuel Map for High Octane Fuel.

[acatlover13]

This is so interesting. I have only had my car for about 20 hours now, and only have 64 miles on it, so I haven't hit it too hard just yet, but compared to my '93 Z28, this thing feels like it will run like a scalded dog.

I am experiencing some of the idle and take off issues that others are experiencing, so I may try this mod in another 1000 miles or so, if the positive reviews keep coming. Thanks for the great info!

[PQ]

Originally Posted by acatlover13

This is so interesting. I have only had my car for about 20 hours now, and only have 64 miles on it, so I haven't hit it too hard just yet, but compared to my '93 Z28, this thing feels like it will run like a scalded dog.

I am experiencing some of the idle and take off issues that others are experiencing, so I may try this mod in another 1000 miles or so, if the positive reviews keep coming. Thanks for the great info!

You're either running off of the high or low fuel tables. If you're car is running good then there is no need to do it.

[PQ]

Please, everyone, if your car is running fast and stong there will be no benefit from pulling the fuses.

My car felt like I was towing something. Had that feeling of pulling a water skier up from the water onto the top of the water. Yes, it was fairly subtle but look at the vids again. You're either running on one end or the other.

If you're getting under 5.5 seconds 0-60 mph then your probably fine. If you're over 6 seconds, then try the fuse pull.

If you can spin the tires on dry pavement by accelerating alone, you don't need to do this.

[GTAHVIT]

NOT THE GREEN WIRE!!! CUT THE RED ONE!!!!!!!

[PQ]

NO BLU..................Yell...............

[Michael Cooper]

i left the fuses out for over 24/hrs and it seems to be working from a dead i punched it and i the tires lighted up (not for very long) but this could of never been done before in regular automatic mode

shifting seems more aggressive and smooth

Thanks alot for the information!

[Warr3nc]

Originally Posted by irpq11

Surely you can't dispute my video evidence?

Let us know tomorrow what happened.





So basically it's truely about what we've been seeing.

Yeah it's pretty much what you all have gone through. Most people would be surprised if they knew the amount of updates the modules on the newer vehicles have. Just the bad part about this issue is it has happened on the HOTTEST car out right now.

[third1]

I noticed mine running rough after initial startup,Gotta do the fuse pull when I get home.

[ssmike]

Originally Posted by Edrock

My LS3 is doing the same thing. I just noticed the last couple of days. Like you, I chalked it up to cold engine but got to thinking, wait a minute. This is a brand new car. It should not get a "jerk or two" on the morning drive to work. It only happens the first few minutes of driving then seems to be OK. Thought I was going crazy. Maybe I should try the fuse pull too. Can't hurt, right?...

My LS3 is in the dealers right now for this exact problem. To make matters worse when I installed an OTR CAI the jerky cold running problem was there even after it was warmed up! I'm going to call my dealer shop tomorrow and let him know about this thread! I will try this as soon as I get it back tomorrow night! Great stuff!!!!!

[PappysCamaro]

Does anyone know if there is a specific order that I need to pull them out in?

Also, Does anyone know what grade gas is put in at the factory?

Thank you.

[Blueclyde]

[QUOTE=irpq11;852034]So yours was running on the high octane table as it should. Congrats.

I was afraid a lot of people would try this who didn't need to. Could be why GM hasn't issued a TSB on it. they don't want eveyone running in and wanting 'the latest'




irpq11, Very, very good point. That could be a real problem for them if just the people from this thread went in for this... No matter what this is a bad-rod ride. This car rocks and GM knocked it out of the park. All these little gremlins will get worked out. They should start by immediately issuing a bulletin to their dealers advising them to use 93 Octane on the pre-delivery fill.

[markbolt]

Where I live I can only gas 93 on the Air Force base I work at. WIll it hurt if I need gas while in town and have to put in 91?

[PQ]

Originally Posted by markbolt

Where I live I can only gas 93 on the Air Force base I work at. WIll it hurt if I need gas while in town and have to put in 91?

I think it would be just fine. GM is in a world of hurt if not. California and all their infinite wisdom sees fit to not get 93.

[Warr3nc]

[QUOTE=Blueclyde;852609]

Originally Posted by irpq11

So yours was running on the high octane table as it should. Congrats.

I was afraid a lot of people would try this who didn't need to. Could be why GM hasn't issued a TSB on it. they don't want eveyone running in and wanting 'the latest'




irpq11, Very, very good point. That could be a real problem for them if just the people from this thread went in for this... No matter what this is a bad-rod ride. This car rocks and GM knocked it out of the park. All these little gremlins will get worked out. They should start by immediately issuing a bulletin to their dealers advising them to use 93 Octane on the pre-delivery fill.

Originally Posted by markbolt

Where I live I can only gas 93 on the Air Force base I work at. WIll it hurt if I need gas while in town and have to put in 91?

I found this in the owners manual section on GM's SI website. So one would really think the dealers would know better to put 87 in the V-8's.
Recommended Fuel

If the vehicle has the 3.6L V6 engine (VIN Code V), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.

If the vehicle has the 6.2L V8 engine (VIN Code W) or the 6.2L V8 engine (VIN Code J), use premium unleaded gasoline with a posted octane rating of 91 or higher. For best performance, use premium unleaded gasoline with a posted octane rating of 93. You can also use regular unleaded gasoline rated at 87 octane or higher, but the vehicle's acceleration could be slightly reduced, and a slight audible knocking noise, commonly referred to as spark knock, might be heard. If the octane rating is less than 87, a heavy knocking noise might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you could damage the engine. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.

I just read the knock sensor description and operation on the SI website as well so it makes me think this whole problem while caused by the dealers was compounded by some programming issues too. I could paste the knock sensor description if anyone would like to read how that system works.